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Doppler imaging method and Doppler imaging device for pulse waves

An imaging method and imaging device technology, applied in the field of pulse wave Doppler imaging technology, can solve the problems of decreased detection sensitivity, increased echo amplitude, and reduced receiving gain

Inactive Publication Date: 2010-10-13
SHENZHEN LANDWIND IND
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  • Abstract
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Problems solved by technology

[0006] In the existing technology, when the flow rate is low, the PRF decreases and the emission voltage increases, but the emission voltage cannot be increased without limit due to the constraints of the maximum value supported by the system power supply and the ultrasonic power index (mechanical index, MI).
In addition, the increase of the transmitting voltage causes the amplitude of the echo to increase. In order to avoid saturation, it is necessary to reduce the receiving gain. The existing variable gain amplifier is limited by technology. After the gain is reduced to a certain value, the noise output of the amplifier will not continue to decrease. Therefore, the detection sensitivity of the actual system is reduced

Method used

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  • Doppler imaging method and Doppler imaging device for pulse waves

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Embodiment Construction

[0032] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0033] In this embodiment, in the non-HPRF (high PRF) mode of pulse Doppler imaging, a fixed PRF is used for a certain depth max to scan. When it is necessary to reduce the speed gear, instead of directly reducing the PRF of the actual scan, it is max The quadrature Doppler signal obtained by scanning is obtained by digital down-sampling. The down-sampled Doppler signal is then subjected to traditional Doppler signal processing such as spectrum analysis and sound signal direction separation to obtain a spectrogram and sound output equivalent to traditional pulse Doppler imaging. When it is necessary to increase the speed gear, scan directly with a higher PRF (when the required PRF exceeds the PRF value given in Method 1 below, enter the HPRF mode), without digital downsampling processing (or downsampling rate Set to 1), and use the traditional Doppler s...

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Abstract

The invention discloses a Doppler imaging method and a Doppler imaging device for pulse waves to keep the high-detection sensitivity at both high and low pulse repetition frequencies (PRFs). In the method and the device, the scanning and imaging are performed under the condition that PRF is less than PRFmax by fixedly using a PRFmax instead of directly using the PRF corresponding to a speed scale, and a digital downsampling process is performed on orthogonal Doppler signals acquired through the PRFmax scanning, including low-pass filter and extraction, and the detection of Doppler signals at a low speed level is realized.

Description

technical field [0001] The present invention proposes a pulse wave (PW) Doppler imaging technology, especially a pulse wave Doppler imaging that can improve the detection sensitivity on the one hand, and can reduce the frequency spectrum aliasing phenomenon that occurs in the pulse wave Doppler technology on the other hand Methods and devices. Background technique [0002] Pulse wave Doppler technology, as an important technology in ultrasonic diagnostic system, is often used in the non-destructive detection of blood flow or moving tissue in the human body. figure 1 It is a typical color Doppler ultrasound diagnostic system. After the ultrasonic wave passes through the transmitting and receiving switch, it is transmitted into the human body by the ultrasonic probe. The echo signals of tissues and blood flow in the human body are received by the probe, and then pass through the transmitting and receiving switch, low noise amplifier (LNA), variable gain amplifier (VCA), The ...

Claims

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Application Information

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IPC IPC(8): A61B8/06A61B8/08
Inventor 张羽
Owner SHENZHEN LANDWIND IND
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